text: Earlier in the afternoon of February 21, dozens of 9A6 students of Ngu Loc Secondary School came to the teacher's room of Literature in the school's dormitory to sit and talk, some drinking beer, cheering?
classes:  No, the teacher and the crowd of 9A6 students of Ngu Loc Secondary School had behaved improperly on the afternoon of February 21.  Also, the teacher and the crowd of 9A6 students of Ngu Loc Secondary School had behaved improperly on the afternoon of February 21.  Yes, the teacher and the crowd of 9A6 students of Ngu Loc Secondary School had behaved improperly on the afternoon of February 21.